1; twist the mirror to allow access to the 2 mounting bolts and undo both with 10mm socket or tube spanner.
2; release the electrical connector by pushing the tab and pulling it apart.
3; remove the black rubber gasket from the base of the mirror. then remove 3 screws and the metal base comes off. then there is 1 screw into the motor that needs removing.
4; carefully lever up the actual mirror from the bottom with something wide, like a paint scraper so you don't crack the mirror. it should un-clip and tilt up away from the main housing. then just wriggle it free from the top mounts.
5; undo the screws to release the plastic mirror surround from the housing. note, there is a clip that you have to release, it's in the picture near the silver housing. (narrow black peice sticking up)
6; undo 3 screws from the white housing and it comes out still attached to the wiring.
7; undo more screws and remove the black plastic backing plate.
8; motor should now be free to remove ( might require some wriggling) and job is done.
hope that is all clear and easy to follow.
accidentally knocked off my side mirror (long story)... got another one on the way thanks to dstocks... looks like I'm going to be doing some soldering though because I had to cut the wires going to the mirrors motor 
